<?php
/**
 * Created by PhpStorm.
 * User: xaq
 * Date: 2017/5/31
 * Time: 6:54
 */

namespace app\api\service;


use app\api\model\Product;
use app\api\model\UserAddress;
use app\lib\exception\OrderException;
use app\lib\exception\UserException;
use app\api\model\Order as OrderModel;
use app\api\model\OrderProduct;
use think\Exception;
use think\Db;

class Order
{
    //订单的商品列表，客户端传递过来的products参数
    protected $oProducts;
    //真实的商品信息（包括库存量）
    protected $products;

    protected $uid;

    //检测库存量，并创建订单
    public function place($uid, $oProducts) {
        //oProducts和products作对比
        //products从数据库中查询出来
        $this->oProducts = $oProducts;
        $this->products = $this->getProductsByOrder($oProducts);
        $this->uid = $uid;
        $status = $this->getOrderStatus();
        if(!$status['pass']) {
            $status['order_id'] = -1;
            return $status;
        }
        //开始创建订单
        $orderSnap = $this->snapOrder($status);
        $order = $this->createOrder($orderSnap);
        $order['pass'] = true;
        return $order;
    }
    //将订单信息写入数据库
    private function createOrder($snap) {
       Db::startTrans(); //使用事物，使两个数据库操作一致
       try{
           $orderNo = $this->makeOrderNo();

           $order = new OrderModel();
           $order->user_id = $this->uid;
           $order->order_no = $orderNo;
           $order->total_price = $snap['orderPrice'];
           $order->total_count = $snap['totalCount'];
           $order->snap_img = $snap['snapImg'];
           $order->snap_name = $snap['snapName'];
           $order->snap_address = $snap['snapAddress'];
           $order->snap_items = json_encode($snap['pStatus']);
           $order->save();

           //$this->oderId = $snap[''];
           $orderID = $order->id;
           $create_time = $order->create_time;
           foreach($this->oProducts as &$p) {
               $p['order_id'] = $orderID;
           }
           $orderProduct = new OrderProduct();
           $orderProduct->saveAll($this->oProducts);
            Db::commit();  //提交
           return [
               'order_no' => $orderNo,
               'order_id' => $orderID,
               'create_time' => $create_time,
           ];
       }catch(Exception $ex){
           Db::rollback(); //回滚
            throw $ex;
       }

    }
    //生成随机订单号
    public static function makeOrderNo()
    {
        $yCode = array('A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J');
        $orderSn =
            $yCode[intval(date('Y')) - 2017] . strtoupper(dechex(date('m'))) . date(
                'd') . substr(time(), -5) . substr(microtime(), 2, 5) . sprintf(
                '%02d', rand(0, 99));
        return $orderSn;
    }
    //生成快照订单
    private function snapOrder($status){
        //快照信息
        $snap = [
            'orderPrice' => 0,
            'totalCount' => 0,
            'pStatus' => [],
            'snapAddress' => null,
            'snapName' => '',
            'snapImg' => '',
        ];
        $snap['orderPrice'] = $status['orderPrice'];
        $snap['totalCount'] = $status['totalCount'];
        $snap['pStatus'] = $status['pStatusArray'];
        //序列化地址数组
        $snap['snapAddress'] = json_encode($this->getUserAdderss());
        $snap['snapName'] = $this->products[0]['name'];
        $snap['snapImg'] = $this->products[0]['main_img_url'];

        if(count($this->products) > 1) {
            $snap['snapName'] .= '等';
        }
        return $snap;
    }
    //根据oProduct和products检查库存信息
    public function checkOrderStock($orderID) {
        $oProducts = OrderProduct::where("order_id","=",$orderID)
            ->select();
        $this->oProducts = $oProducts;
        $this->products = $this->getProductsByOrder($oProducts);
        $status = $this->getOrderStatus();
        return $status;
    }

    private function getUserAdderss() {
        $userAddress = UserAddress::where('user_id','=',$this->uid)
            ->find();
        if(!$userAddress) {
            throw new UserException([
                'msg' => '用户收货地址不存在,下单失败',
                'errorCode' => 60001
            ]);
        }
        return $userAddress->toArray();
    }

    private function getOrderStatus() {
        $status = [
            'pass' => true,
            'orderPrice' => 0,
            'totalCount' => 0,
            'pStatusArray' => []   //商品的详情信息
        ];

        foreach($this->oProducts as $oProduct) {
            $pStatus = $this->getProductStatus(
                $oProduct['product_id'],$oProduct['count'],$this->products
            );
            if(!$pStatus['haveStock']) {
                $status['pass'] = false;
            }
            $status['orderPrice'] += $pStatus['totalPrice'];
            $status['totalCount'] += $pStatus['count'];
            array_push($status['pStatusArray'],$pStatus);
        }
        return $status;
    }

    private function getProductStatus($oPID, $oCount, $products) {
        $pIndex = -1;
        $pStatus = [
            'id' => null,
            'haveStock' => false,
            'count' => 0,
            'name' => '',
            'totalPrice' => 0
        ];

        for($i=0;$i<count($products);$i++){
            if($oPID == $products[$i]['id']){
                $pIndex = $i;
            }
        }
        if($pIndex == -1) {
            throw new OrderException([
                'msg' => 'id为'.$oPID.'的商品不存在，创建订单失败'
            ]);
        }else{
            $product = $products[$pIndex];
            $pStatus['id'] = $product['id'];
            $pStatus['name'] = $product['name'];
            $pStatus['count'] = $oCount;
            $pStatus['totalPrice'] = $product['price'] * $oCount;

            if($product['stock'] - $oCount >=0 ){
                $pStatus['haveStock'] = true;
            }
        }
        return $pStatus;
    }

    //根据订单信息查找真实的商品信息
    private function getProductsByOrder($oProducts) {
        $oPIDs = [];
        foreach($oProducts as $item){
            array_push($oPIDs,$item['product_id']);
        }
        $products = Product::all($oPIDs)
            ->visible(['id','price','stock','name','main_img_url'])
            ->toArray();
        return $products;
    }
}